The best replacement for 2.8 is 1.8t.

The best alternatives to 2.8 are rated as following:
★★★★★  1.8t
★★★★★  4.3
★★★★  3.0 patrol
★★★  2.9 vr6
★★★  3.5
★★★  5.6
★★  1.4
★★  1.8
★★  4.0
★  3.06
★  50mm 1.8
★  f4
★  3.4
★  canon 70 200 2.8
  2.66
  3.2
  f 4
  1.8 aperture
  vr
  1.4 aperture
  1.8 t
  2.7t
  70-200 4
  nikon 70-200 2.8
  3.5 f
  f 3.5
  sigma 70 200 2.8
  tamron 17-50 2.8
  tamron
  nikon 24-70 2.8
  3.1
  2.4 ghz
  sigma 70-200 2.8
  3.2 mac pro
  70-200
  f/1.8
  3.5 f stop
  f\/3.5
  200-400
  2.9

Your alternative for 2.8 is not listed? Suggest!
Speaking about 2.8, one probably shouldn't forget about ufraw.

Other search terms related to 2.8 and their ratings are:
★★★★★ ufraw
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2.8
1.8t
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